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| author | Jonas Paulsson <paulsson@linux.vnet.ibm.com> | 2017-05-12 06:32:03 +0000 |
|---|---|---|
| committer | Jonas Paulsson <paulsson@linux.vnet.ibm.com> | 2017-05-12 06:32:03 +0000 |
| commit | d1ec738502b24454f98bee9cd1206aa2854a4eb8 (patch) | |
| tree | 48d47e8f158e32ac9a1bb5436279ca51ecfe5576 /llvm/test/CodeGen/SystemZ | |
| parent | ce3ec4519b602cf5a58a379b6a3b8471690403a5 (diff) | |
| download | bcm5719-llvm-d1ec738502b24454f98bee9cd1206aa2854a4eb8.tar.gz bcm5719-llvm-d1ec738502b24454f98bee9cd1206aa2854a4eb8.zip | |
Handle a COPY with undef source operand in LowerCopy()
Llvm-stress discovered that a COPY may end up in ExpandPostRA::LowerCopy()
with an undef source operand. It is not possible for the target to handle
this, as this flag is not passed to TII->copyPhysReg().
This patch solves this by treating such a COPY as an identity COPY.
Review: Matthias Braun
https://reviews.llvm.org/D32892
llvm-svn: 302877
Diffstat (limited to 'llvm/test/CodeGen/SystemZ')
| -rw-r--r-- | llvm/test/CodeGen/SystemZ/lower-copy-undef-src.mir | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/SystemZ/lower-copy-undef-src.mir b/llvm/test/CodeGen/SystemZ/lower-copy-undef-src.mir new file mode 100644 index 00000000000..322460d79d6 --- /dev/null +++ b/llvm/test/CodeGen/SystemZ/lower-copy-undef-src.mir @@ -0,0 +1,14 @@ +# RUN: llc -mtriple=s390x-linux-gnu -mcpu=z13 -run-pass=postrapseudos -o - %s | FileCheck %s +# +# Test that a COPY with an undef source operand gets handled like an identity +# copy rather than lowered into a target instruction with the undef flag +# dropped. +--- +# CHECK-LABEL: name: undef_copy +# CHECK: %r13d = KILL undef %r0d, implicit killed %r12q, implicit-def %r12q +name: undef_copy +tracksRegLiveness: true +body: | + bb.0: + liveins: %r12q + %r13d = COPY undef %r0d, implicit killed %r12q, implicit-def %r12q |
